GM bulletin 23-NA-162
What it saysThis service bulletin advises the tech of updated Diagnostic procedures in Service Information (SI) to avoid misdiagnosis when addressing a customer concern of Service Rear Axle Message displayed on the Driver… NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Nov 30, 2023, received Dec 9, 2023, about the equipment. It names 11 model years across Buick and Cadillac (2016–2019). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
One page for every brand it was filed under. Each brand’s bulletins: Buick · Cadillac.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis service bulletin advises the tech of updated Diagnostic procedures in Service Information (SI) to avoid misdiagnosis when addressing a customer concern of Service Rear Axle Message displayed on the Driver information Center (DIC).
Trouble codes it names: C0393 C039F C0407 C0408 all 4 read from the document itself; NHTSA’s summary names none
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 23-NA-162 | Service bulletin | Nov 30, 2023 | 10246488 | PDF, 489 KB |
What the document itself lists
The manufacturer titles it “Information on Service Rear Axle Message Displayed on Driver Information Center”.
Part the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 19435486 | — | — |
Read by machine from the document NHTSA serves (2 pages), read Sep 30, 2026. A part number is shown only where it matches GM’s own catalogue shape, an operation only with its code and time, and a description only where the reader got it whole; anything it could not settle is left out, and the PDF is the record. Times are the manufacturer’s warranty allowances, not a quote. Listings and prices on eBay Motors are the seller’s.
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The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Model years it names
Source: as the manufacturer filed themBuick 6 model years
Cadillac 5 model years
A vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
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What owners reported
Source: NHTSA complaint databaseOwners of the 11 model years this bulletin names have filed 426 complaints with NHTSA since 2015. 97 of them name Electrical System, Power Train — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
The contact owns a 2016 Cadillac Srx. The contact stated that there was an extensive clunking noise coming from the transmission. The dealer stated that two of the gears may not have enough clearance, which could be the cause of the noise. The vehicle was not repaired. The manufacturer was contacted and was to follow-up with the dealer.
2016 Cadillac SRX · Power Train · filed with NHTSA Jun 19, 2019 · ODI 11221209
The contact owns a 2017 Buick Lacrosse. The contact stated that after his wife had parked and turning off the vehicle, moments later the vehicle was restarted and the check engine and TCM warning lights remained illuminated. Additionally, the transmission shifter failed to shift out of park. The vehicle towed to the local dealer.
2017 Buick LaCrosse · Power Train · filed with NHTSA Dec 29, 2023 · ODI 11562549
Infotainment center malfunctioning. Climate control, backup camera and nearly every convenience and safety feature disabled. Cadillac has attempted to fix 5 times and now says that it can not be corrected. Cadillac also acknowledges that this is a known issue. Screen pixelates and/or goes black when the vehicle is in motion
2018 Cadillac XTS · Electrical System · filed with NHTSA May 16, 2020 · ODI 11324798
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
More bulletins about the equipment
Source: same model, same component group33 other manufacturer communications filed against these GM models under the same component group (equipment), newest first. The eight newest are listed; the rest are on the Buick list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| PIP5601B | Service bulletin | Jul 18, 2025 | This Preliminary Information communication provides information to the technician about vibration complaints that are one of the most challe… |
| 17-NA-073 | Service bulletin | Mar 5, 2025 | This warranty administration bulletin provides policy information with the field action courtesy transportation policy. |
| 17-NA-331 | Service bulletin | Jan 17, 2025 | Rear View Camera Guidelines Not Present at Times Condition Some customers may report that the Rear View Camera (RVC) guidelines are temp… |
| 18-NA-263 | Service bulletin | Dec 14, 2024 | This warranty administration bulletin provides policy information for variable diagnostic time allowances on select labor operations… |
| 24-NA-040 | Service bulletin | Oct 11, 2024 | This service bulletin provides information on All hazmat parts being returned to the Warranty Parts Center (WPC) must be shipped using Centr… |
| 23-NA-154 | Service bulletin | Oct 2, 2024 | This bulletin provides information on Warranty Administration â Required Operating Procedures - 8 Points (U.S. Only). |
| 23-NA-219 | Service bulletin | Sep 21, 2024 | This service bulletin provides information on Concerns or Questions Regarding Installation of Dealer Installed Accessories. |
| 18-NA-146 | Service bulletin | Sep 14, 2024 | This warranty administration bulletin provides policy information, proper labor operation selection and causal part identification for warra… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Buick and Cadillac, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is GM 23-NA-162 a recall?
No. A service bulletin is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the 23-NA-162 repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way. Every GM warranty extension on file lists the ones GM has filed.
Which vehicles does 23-NA-162 cover?
The manufacturer filed it against 11 model years across 2 brands (Buick and Cadillac): 2017 Buick LaCrosse, 2016 Buick LaCrosse, 2019 Buick Regal, 2018 Buick Regal, 2017 Buick Regal, 2016 Buick Regal and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.